Champions League: Matchday One

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Photos:Tuesday's European action

Lionel Messi celebrates one of his three goals as Barcelona recorded its largest Champions League victory when thrashing Celtic 7-0 at Camp Nou.

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Photos:Tuesday's European action

Barcelona fans hold up Catalan flags during the match against Celtic. The flag, known locally as the "Estelada," has in recent years become a symbol of the independence movement within Catalonia. UEFA outlaws the use of objects that transmit political messages.

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Photos:Tuesday's European action

Joshua Kimmich scored his first Champions League goal for Bayern Munich, who beat Rostov 5-0, in a month where he has already registered his first strikes for Germany and in the Bundesliga.

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Photos:Tuesday's European action

Marco Verratti and Olivier Giroud clash seconds before their red cards as Arsenal came from behind to earn a 1-1 draw at Paris Saint-Germain.

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Photos:Tuesday's European action

Saul Niguez broke local resistance when volleying home the only goal as last season's Champions League runner-up Atletico Madrid won 1-0 at PSV Eindhoven.

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Photos:Tuesday's European action

Talisca is buried by his Besiktas teammates after scoring a dramatic long-range free-kick -- converted in the 93rd minute -- to earn a 1-1 draw against parent club Benfica.

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Photos:Tuesday's European action

Matias Delgado celebrates as Renato Steffen (not pictured) gives Basel the lead in the Swiss club's 1-1 draw at home to Bulgarian side Ludogorets.

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Photos:Tuesday's European action

Dynamo Kiev goalkeeper Olexandr Shovkovskiy made history by becoming the second oldest player to contest a Champions League match but he was beaten twice by Arkadiusz Milik, pictured on the floor, as Napoli won 2-1.